First up MCU chief Kevin Feige took the stage, introducing the big bad Thanos himself, Josh Brolin, and before long he was joined by a hefty roster of heroes. Pom Klementieff ( Mantis) , Karen Gillan ( Nebula) and Dave Bautista ( Drax) Don Cheadle ( War Machine) , Elizabeth Olsen ( Scarlet Witch) , Paul Bettany ( Vision) , Sebastian Stan ( The Winter Soldier) , Anthony Mackie ( Falcon) , Benedict Cumberbatch ( Doctor Strange) , Tom Holland ( Spider-Man) , and Chadwick Boseman( Black Panther) all took the stage to debut the first look